Mailbox mail delivery signal



FIG. 1 is a front plan view of a mailbox mail delivery signal of the present invention shown mounted on a mailbox, signal plate, and connecting chain being shown in phantom;

FIG. 2 is a side elevational view thereof, the right and left side elevational views being identical;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a rear elevational view thereof.

The phantom lines showing the mailbox, the signal plate, and the chain connecting the signal plate to the mailbox forms no part of the claimed design. 

The ornamental design for mailbox mail delivery signal, as shown and described. 